How can I draw a circle in this image from the edges that I marked and calculate the angle from the circle like this ?

I want to know the code. i'm not good at coding sir.Thankyou.

Answer 1

[Image Analyst]

Assuming you have (x1, y1) on the left side and (x2, y2) on the right side, simply use plot

hold on;
xCenter1 = (x1+x2)/2;
yCenter1 = (y1+y2)/2;
plot(xCenter1, yCenter1, 'w.', 'MarkerSize', 30);
xCenter2 = (x3+x4)/2;
yCenter2 = (y3+y4)/2;
plot(xCenter2, yCenter2, 'w.', 'MarkerSize', 30);

To get the angle of the line, you can use atand2d(), something like

dx = xCenter2-xCenter1;
dy = yCenter2-yCenter1;
angle = atand2d(dy, dx);

[wongsathorn pinwihok]

how can i define the 2 markers ? if i want to use this markers with every images like this .

[Image Analyst]

What markers are you talking about? I assume you have the edge, which you can get from thresholding for the top and bottom left red X. The bottom right X shows up in the middle of skin. You should search Vision Bibliography for papers on feet or ankles. It is a list of all image processing articles.

Or you can use drawpoint() to have the user place them manually.